An Airplane Flies in a Horizontal Circle of Radius 500

Multiple Choice

An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the plane were to fly in the same 1000 m circle at a speed of 300 m/s, by what factor would its centripetal acceleration change?

A) 0.25
B) 0.50
C) 1.00
D) 2.00
E) 4.00